Deformed wire for concrete reinforcement

ABSTRACT

A wire having overlapping rows of indentations in the surface thereof whereby deformation roll wear and/or improper roll adjustment are visually indicated by the deviations from the desired amount of overlap.

United States Patent Wildt 1 Feb. 15, 1972 [54] DEFORMED WIRE FOR CONCRETE [56] References Cited REINFORCEMENT UNITED STATES PATENTS [72] wild" Bethlehem 982,682 1/1911 Johnson .52/739 [73] Assignee: Bethlehem Steel Corporation 2,552,364 5/1951 Bradbury..... ....72/l98 3,186,206 6/1965 Gillberg... ....72/l94 [22] 191970 3,335,539 8/1967 Soretz .52/737 [21] Appl. No.: 55,558

Primary Examiner-Lowell A. Larson Related pp Dam Attorney-Joseph J. O'Keefe [62] of Ser. No. 781,320, Dec. 5, 1968, aban- ABS CT A wire having overlapping rows of indentations in the surface I 1 52/737, 72/366 thereof whereby deformation roll wear and/or improper roll I lnt. adju tment are vi ually indicated the deviations from [he [58] Field of Search ..52/737, 739; 72/194, 198, 225, desired amount ofoverlap.

2 Claims, 5 Drawing Figures PATENTEDFEB 15 m2 INVENTOR Raye! H ll/f/c/f I S//////////// v DEFORMED WIRE FOR CONCRETE REINFORCEMENT CROSS-REFERENCES TO RELATED APPLICATIONS This application is a division of US. application Ser. No. 781,320, filed Dec. 5, 1968, now abandoned, by the present inventor.

BACKGROUND OF THE INVENTION This invention relates to deformed wire, and more particularly to deformed wire for use in concrete to contribute to the strength of the composite structure.

Deformed wire is made by passing wire through one or more sets of rolls which may produce either projections on, or indentations in, the surface of the wire. Initially, each set of rolls must be adjusted so that either the projections are of the proper height or the indentations are of the proper depth. During the rolling of the wire, the rolls must periodically be adjusted, because of roll wear, to maintain the desired height or depth. When there is excessive wear, the roll must be replaced.

In the case of wire having projections on the surface thereof, it is relatively easy to measure the height of the projections and thus determine whether adjustment of the rolls is necessary. However, in the case of wire having indentations therein, and particularly where such indentations are oblique- 1y disposed relative to the axis of said wire, it is quite difficult to determine the depth of the indentations and hence the need for roll adjustment or replacement.

It is an object of this invention to provide a deformed wire having an indented deformation pattern visually indicative of deformation roll maladjustment or wear.

SUMMARY OF THE INVENTION I have discovered that the foregoing object can be attained by providing a wire with a deformation pattern comprising first and second longitudinal rows of elongated indentations, one end of the indentations of each row overlapping a projected axial line along the surface of said wire contiguous to the outermost point of the indentations of the other row, the depth of the overlapping portions of said indentations being less than the depth of the nonoverlapping portions thereof.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are side elevation views of the wire of the invention.

FIG. 3 is a sectional view, taken along the line 33 of FIG. 1.

FIG. 4 is a fragmented sectional view taken along the line 4-4 of FIG. 2.

FIG. 5 is a diagrammatic view of a machine for producing the wire of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT FIGS. 1 and 2 show a cold rolled wire of circular cross section which has been passed through a deforming machine which produces the deformation pattern shown. As can be seen from these figures, in combinations with the sectional view in FIG. 3, said wire has a deformation pattern comprising four longitudinal rows of elongated indentations 12, 14, I6 and I8, respectively.

Each indentation extends across the surface of the wire through an arc which intersects an angle of approximately 100 relative to the axis of the wire. Said rows are uniformly spaced about the periphery of the wire so that the indentations in each row overlap a projected axial line contiguous to the outermost point of the indentations of each adjacent row a distance extending through an arc which intersects an angle of approximately 10 relative to the axis of the wire. FIG. 1 shows the indentations l4 overlapping a projected axial line contiguous to the outermost point of the indentations 12.

Similarly, the indentations 12 overlap a projected axial line 22 contiguous to the outermost point of the indentations 14.

As can be seen in FIGS. 3 and 4, the overlapping portions of disposed about an axis which is perpendicular to that of the first. Each roll is provided with projections 30 for producing one row of indentations in the surface of the wire 10.

Each roll is mounted in a housing 32 whichcan be moved either toward or away from the wire 10 by suitable means. For example, a shaft 34 may be provided having left-hand threads which engage one of said housings and right-hand threads which engage the housing oppositely disposed therefrom. The shaft 34 is joumaled in split mounting blocks 36 which are secured to a supporting structure 37 by screws 38. The shaft 34 is provided with grooves 39 which are engaged by keys 40, and may be rotated by any suitable means. The rolls may be rotated by either of two ways, viz by the action of the wire being drawn through the rolls or by the action of an external power source driving one pair or both pairs of rolls by a shaft or shafts indicated as 41.

The above-described deformation pattern greatly facilitates initial roll adjustment. For example, if the rolls of either set of rolls are too far apart, a visual examination of the wire, preferably by sighting along the lines 20 and 22, will show little or no overlap of the indentations of adjacent rows. If the rolls are too close together, a visual examination of the wire will show that the overlap of the indentations of adjacent rows is excessive.

During the wire-deforming operation, the projections 30 will gradually wear, causing the depth of the indentations to decrease. As the depth of the projections 30 decreases, the amount of overlap of the indentations of adjacent rows decreases. When there is little or no overlap, the rolls may be moved closer together to restore the desired amount of overlap or, if there is excessive wear, the rolls may be replaced.

Preferably, the indentations are obliquely disposed relative to the axis of the wire, as there is less roll vibration and the resultant wire has higher fatigue strength than in the case where the indentations are perpendicular to the axis of the wire.

I claim:

1. A method of producing a wire having on the surface thereof a deformation pattern visually indicative of roll wear or improper deformation roll adjustment comprising:

a. passing a wire of substantially circular cross section between a first set of oppositely disposed rolls, said rolls being provided with projections obliquely disposed relative to the axis of said wire whereby first and second rows of indentations are produced in said wire,

b. passing said wire between a second set of oppositely disposed rolls, said second set of rolls being disposed about axes which are perpendicular to the axes of said first set of rolls, each of said rolls of said second set being provided with projections obliquely disposed relative to the axis of said wire whereby third and fourth rows of indentations are produced in said wire, and

c. adjusting the spacing between each set of rolls until the projections in each of said rolls produce on said wire a row of indentations the ends of which overlap a projected axial line contiguous to the end points of the indentations of each adjacent row.

2. The method as recited in claim 1, in which the ends of the indentations in each row overlap said projected axial line by a distance comprising the arc of an angle of approximately 10 whose vertex lies along the axis of said wire. 

1. A method of producing a wire having on the surface thereof a deformation pattern visually indicative of roll wear or improper deformation roll adjustment comprising: a. passing a wire of substantially circular cross section between a first set of oppositely disposed rolls, said rolls being provided with projections obliquely disposed relative to the axis of said wire whereby first and second rows of indentations are produced in said wire, b. passing said wire between a second set of oppositely disposed rolls, said second set of rolls being disposed about axes which are perpendicular to the axes of said first set of rolls, each of said rolls of said second set being provided with projections obliquely disposed relative to the axis of said wire whereby third and fourth rows of indentations are produced in said wire, and c. adjusting the spacing between each set of rolls until the projections in each of said rolls produce on said wire a row of indentations the ends of which overlap a projected axial line contiguous to the end points of the indentations of each adJacent row.
 2. The method as recited in claim 1, in which the ends of the indentations in each row overlap said projected axial line by a distance comprising the arc of an angle of approximately 10* whose vertex lies along the axis of said wire. 